I see no arguments in favor of keeping it as 'YY in any of these threads, not on a UX design level anyway. I do see various people, including the man himself, give an excellent use case as to what the benefit to this change would be:
The fix for this seems to be a simple text replacement for 'YY → YYYY, avoiding a couple matches where ' is used as the beginning of a string instead. I can make that PR.